An IT director is looking to reduce the footprint of their company’s server environment. They have
decided to move several internally developed software applications to an alternate environment,
supported by an external company. Which of the following BEST describes this arrangement?

A.
Infrastructure as a Service

B.
Storage as a Service

C.
Platform as a Service

D.
Software as a Service

Explanation:
Cloud users install operating-system images and their application software on the cloud infrastructure to
deploy their applications. In this model, the cloud user patches and maintains the operating systems and
the application software.
Incorrect Answers:
B: Storage as a Service (SaaS) is a business model in which third-party providers rent space on their
storage to end users that lack the capital budget and/or technical personnel to implement and maintain
their own storage infrastructure.
C: This entails cloud providers deliver a computing platform, typically including operating system,
programming language execution environment, database, and web server.
D: Software as a Service (SaaS) is sometimes referred to as “on-demand software” and is usually priced on
a pay-per-use basis or using a subscription fee.

http://en.wikipedia.org/wiki/Cloud_computing
http://searchstorage.techtarget.com/definition/Storage-as-a-Service-SaaS